r - 尝试用逗号分隔时出现 strsplit 错误

Question

我有矢量图

length
# [1] 15,34, 12,24, 225,
# Levels: 12,24, 15,34, 225,

我想用逗号分隔它们以最终列出这些值

试过：

strsplit(length, ",") 

但不断收到错误消息

Error in strsplit(length, ",") : non-character argument

Answer 1

您的“长度”对象是factor：

如错误消息所示，strsplit需要一个字符向量作为输入。

尝试：

strsplit(as.character(length), ",") 

演示

x <- factor(c("1,2", "3,4", "5,6"))
strsplit(x, ",")
# Error in strsplit(x, ",") : non-character argument
strsplit(as.character(x), ",")
# [[1]]
# [1] "1" "2"
# 
# [[2]]
# [1] "3" "4"
# 
# [[3]]
# [1] "5" "6"

Answer 2

您也可以使用：（x来自@Ananda Mahto 的帖子）

 library(stringr)
 str_split(x, ",")
 #[[1]]
 # [1] "1" "2"

 #[[2]]
 #[1] "3" "4"

 #[[3]]
 #[1] "5" "6"

或者

  str_extract_all(x, "[0-9]+")

或者

 library(stringi)
 stri_extract_all_regex(x, "[0-9]+")